They seem to be putting a lot of thought into the coding and artwork whenever they talk about it, so I doubt it's actually going to bad. I think there will probably be some people who have issues with authenticity though.
I think that there'll be a lot of people hating it for the sake of hating it, which'll drown out the people who have genuine complaints.
Though the way the developers have behaved some days will survive whether the mod is good or not.
Edited:
Black mesa is a perfect example of why VALVe doesent release content. Black mesa has been taking forever but they constantly update their media, people still whine. HL3 doesnt release content, people still whine. Valve is doing a buisness strategy because they know if they release content people will still whine that "OMG C0NT3NT, Y U N0 R3L3SE Y3T??!?!?!11!?". I also dont know why people think hl3 is dead, that part I cant compute.
See, the developers are saying the same thing. They've basically said "when we don't release content people whine, when we do people whine, so we're not gonna release anything".
It's stupid because if people are going to whine either way, you may as well please the people who aren't.